/**
 *       Copyright (c) 2012 Lukas Zaruba
 *
 *   This file is part of Robot Playground.
 *
 *   Robot Playground is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   Robot Playground is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with Robot Playground. If not, see <http://www.gnu.org/licenses/>.
 */
package net.zarubsys.robotplayground.joystick;

import java.util.HashMap;
import java.util.Map;

/**
 * JoystickNativeAccessorHelper
 *
 * @author Lukas Zaruba, lukas.zaruba@gmail.com
 */
public class JoystickNativeAccessorHelper {
	
	private final Map<String, JoystickNativeAccessor> cache = new HashMap<>();
	
	private static final JoystickNativeAccessorHelper INSTANCE = new JoystickNativeAccessorHelper();
	
	private JoystickNativeAccessorHelper() {
		// to prevent instantiation
	}
	
	public static JoystickNativeAccessorHelper getInstance() {
		return INSTANCE;
	}
	
	public JoystickNativeAccessor getAccessor(String device) {
		synchronized (this) {
			JoystickNativeAccessor accessor = cache.get(device);
			if (accessor == null) {
				accessor = new JoystickNativeAccessor(device);
				cache.put(device, accessor);
			}
			return accessor;
		}
	}
	
	public void closeAccessor(String device) {
		synchronized (this) {
			JoystickNativeAccessor accessor = cache.remove(device);
			if (accessor == null) {
				throw new IllegalArgumentException("There is no accessor for device " + device + " cannot close it!");
			}
			accessor.close();
		}
	}

}

